Commit | Line | Data |
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050ac52c | 1 | /* |
264d9b7d | 2 | * Copyright (c) 2008, 2009 open80211s Ltd. |
050ac52c LCC |
3 | * Author: Luis Carlos Cobo <luisca@cozybit.com> |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
5a0e3ad6 | 10 | #include <linux/slab.h> |
2cca397f | 11 | #include "wme.h" |
050ac52c LCC |
12 | #include "mesh.h" |
13 | ||
27db2e42 | 14 | #ifdef CONFIG_MAC80211_VERBOSE_MHWMP_DEBUG |
7646887a JC |
15 | #define mhwmp_dbg(fmt, args...) \ |
16 | printk(KERN_DEBUG "Mesh HWMP (%s): " fmt "\n", sdata->name, ##args) | |
27db2e42 RP |
17 | #else |
18 | #define mhwmp_dbg(fmt, args...) do { (void)(0); } while (0) | |
19 | #endif | |
20 | ||
050ac52c LCC |
21 | #define TEST_FRAME_LEN 8192 |
22 | #define MAX_METRIC 0xffffffff | |
23 | #define ARITH_SHIFT 8 | |
24 | ||
25 | /* Number of frames buffered per destination for unresolved destinations */ | |
26 | #define MESH_FRAME_QUEUE_LEN 10 | |
27 | #define MAX_PREQ_QUEUE_LEN 64 | |
28 | ||
29 | /* Destination only */ | |
30 | #define MP_F_DO 0x1 | |
31 | /* Reply and forward */ | |
32 | #define MP_F_RF 0x2 | |
d611f062 RP |
33 | /* Unknown Sequence Number */ |
34 | #define MP_F_USN 0x01 | |
35 | /* Reason code Present */ | |
36 | #define MP_F_RCODE 0x02 | |
050ac52c | 37 | |
90a5e169 RP |
38 | static void mesh_queue_preq(struct mesh_path *, u8); |
39 | ||
a00de5d0 LCC |
40 | static inline u32 u32_field_get(u8 *preq_elem, int offset, bool ae) |
41 | { | |
42 | if (ae) | |
43 | offset += 6; | |
ae7245cb | 44 | return get_unaligned_le32(preq_elem + offset); |
a00de5d0 LCC |
45 | } |
46 | ||
d611f062 RP |
47 | static inline u32 u16_field_get(u8 *preq_elem, int offset, bool ae) |
48 | { | |
49 | if (ae) | |
50 | offset += 6; | |
51 | return get_unaligned_le16(preq_elem + offset); | |
52 | } | |
53 | ||
050ac52c | 54 | /* HWMP IE processing macros */ |
a00de5d0 LCC |
55 | #define AE_F (1<<6) |
56 | #define AE_F_SET(x) (*x & AE_F) | |
57 | #define PREQ_IE_FLAGS(x) (*(x)) | |
58 | #define PREQ_IE_HOPCOUNT(x) (*(x + 1)) | |
59 | #define PREQ_IE_TTL(x) (*(x + 2)) | |
60 | #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0) | |
61 | #define PREQ_IE_ORIG_ADDR(x) (x + 7) | |
497888cf PC |
62 | #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0) |
63 | #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x)) | |
64 | #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x)) | |
d19b3bf6 RP |
65 | #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26)) |
66 | #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27) | |
497888cf | 67 | #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x)) |
a00de5d0 LCC |
68 | |
69 | ||
70 | #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x) | |
71 | #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x) | |
72 | #define PREP_IE_TTL(x) PREQ_IE_TTL(x) | |
25d49e4d TP |
73 | #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21) |
74 | #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x)) | |
497888cf PC |
75 | #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x)) |
76 | #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x)) | |
25d49e4d TP |
77 | #define PREP_IE_TARGET_ADDR(x) (x + 3) |
78 | #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0) | |
a00de5d0 | 79 | |
d611f062 | 80 | #define PERR_IE_TTL(x) (*(x)) |
d19b3bf6 RP |
81 | #define PERR_IE_TARGET_FLAGS(x) (*(x + 2)) |
82 | #define PERR_IE_TARGET_ADDR(x) (x + 3) | |
497888cf PC |
83 | #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0) |
84 | #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0) | |
050ac52c | 85 | |
050ac52c | 86 | #define MSEC_TO_TU(x) (x*1000/1024) |
d19b3bf6 RP |
87 | #define SN_GT(x, y) ((long) (y) - (long) (x) < 0) |
88 | #define SN_LT(x, y) ((long) (x) - (long) (y) < 0) | |
050ac52c LCC |
89 | |
90 | #define net_traversal_jiffies(s) \ | |
472dbc45 | 91 | msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) |
050ac52c | 92 | #define default_lifetime(s) \ |
472dbc45 | 93 | MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout) |
050ac52c | 94 | #define min_preq_int_jiff(s) \ |
472dbc45 JB |
95 | (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval)) |
96 | #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries) | |
050ac52c | 97 | #define disc_timeout_jiff(s) \ |
472dbc45 | 98 | msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout) |
050ac52c LCC |
99 | |
100 | enum mpath_frame_type { | |
101 | MPATH_PREQ = 0, | |
102 | MPATH_PREP, | |
90a5e169 RP |
103 | MPATH_PERR, |
104 | MPATH_RANN | |
050ac52c LCC |
105 | }; |
106 | ||
15ff6365 JB |
107 | static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
108 | ||
050ac52c | 109 | static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, |
d19b3bf6 | 110 | u8 *orig_addr, __le32 orig_sn, u8 target_flags, u8 *target, |
15ff6365 JB |
111 | __le32 target_sn, const u8 *da, u8 hop_count, u8 ttl, |
112 | __le32 lifetime, __le32 metric, __le32 preq_id, | |
d19b3bf6 | 113 | struct ieee80211_sub_if_data *sdata) |
050ac52c | 114 | { |
f698d856 | 115 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 116 | struct sk_buff *skb; |
050ac52c | 117 | struct ieee80211_mgmt *mgmt; |
3b69a9c5 TP |
118 | u8 *pos, ie_len; |
119 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + | |
120 | sizeof(mgmt->u.action.u.mesh_action); | |
050ac52c | 121 | |
3b69a9c5 TP |
122 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + |
123 | hdr_len + | |
124 | 2 + 37); /* max HWMP IE */ | |
050ac52c LCC |
125 | if (!skb) |
126 | return -1; | |
127 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
3b69a9c5 TP |
128 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
129 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
130 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
131 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
132 | |
133 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 134 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
90a5e169 | 135 | /* BSSID == SA */ |
47846c9b | 136 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
137 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; |
138 | mgmt->u.action.u.mesh_action.action_code = | |
139 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
050ac52c LCC |
140 | |
141 | switch (action) { | |
142 | case MPATH_PREQ: | |
7646887a | 143 | mhwmp_dbg("sending PREQ to %pM", target); |
050ac52c LCC |
144 | ie_len = 37; |
145 | pos = skb_put(skb, 2 + ie_len); | |
146 | *pos++ = WLAN_EID_PREQ; | |
147 | break; | |
148 | case MPATH_PREP: | |
7646887a | 149 | mhwmp_dbg("sending PREP to %pM", target); |
050ac52c LCC |
150 | ie_len = 31; |
151 | pos = skb_put(skb, 2 + ie_len); | |
152 | *pos++ = WLAN_EID_PREP; | |
153 | break; | |
90a5e169 | 154 | case MPATH_RANN: |
7646887a | 155 | mhwmp_dbg("sending RANN from %pM", orig_addr); |
90a5e169 RP |
156 | ie_len = sizeof(struct ieee80211_rann_ie); |
157 | pos = skb_put(skb, 2 + ie_len); | |
158 | *pos++ = WLAN_EID_RANN; | |
159 | break; | |
050ac52c | 160 | default: |
812714d7 | 161 | kfree_skb(skb); |
050ac52c LCC |
162 | return -ENOTSUPP; |
163 | break; | |
164 | } | |
165 | *pos++ = ie_len; | |
166 | *pos++ = flags; | |
167 | *pos++ = hop_count; | |
168 | *pos++ = ttl; | |
25d49e4d TP |
169 | if (action == MPATH_PREP) { |
170 | memcpy(pos, target, ETH_ALEN); | |
171 | pos += ETH_ALEN; | |
172 | memcpy(pos, &target_sn, 4); | |
050ac52c | 173 | pos += 4; |
25d49e4d TP |
174 | } else { |
175 | if (action == MPATH_PREQ) { | |
176 | memcpy(pos, &preq_id, 4); | |
177 | pos += 4; | |
178 | } | |
179 | memcpy(pos, orig_addr, ETH_ALEN); | |
180 | pos += ETH_ALEN; | |
181 | memcpy(pos, &orig_sn, 4); | |
90a5e169 RP |
182 | pos += 4; |
183 | } | |
25d49e4d TP |
184 | memcpy(pos, &lifetime, 4); /* interval for RANN */ |
185 | pos += 4; | |
050ac52c LCC |
186 | memcpy(pos, &metric, 4); |
187 | pos += 4; | |
188 | if (action == MPATH_PREQ) { | |
25d49e4d | 189 | *pos++ = 1; /* destination count */ |
d19b3bf6 | 190 | *pos++ = target_flags; |
d19b3bf6 | 191 | memcpy(pos, target, ETH_ALEN); |
90a5e169 | 192 | pos += ETH_ALEN; |
d19b3bf6 | 193 | memcpy(pos, &target_sn, 4); |
25d49e4d TP |
194 | pos += 4; |
195 | } else if (action == MPATH_PREP) { | |
196 | memcpy(pos, orig_addr, ETH_ALEN); | |
197 | pos += ETH_ALEN; | |
198 | memcpy(pos, &orig_sn, 4); | |
199 | pos += 4; | |
90a5e169 | 200 | } |
050ac52c | 201 | |
62ae67be | 202 | ieee80211_tx_skb(sdata, skb); |
050ac52c LCC |
203 | return 0; |
204 | } | |
205 | ||
2cca397f JC |
206 | |
207 | /* Headroom is not adjusted. Caller should ensure that skb has sufficient | |
208 | * headroom in case the frame is encrypted. */ | |
209 | static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata, | |
210 | struct sk_buff *skb) | |
211 | { | |
2cca397f JC |
212 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
213 | ||
214 | skb_set_mac_header(skb, 0); | |
215 | skb_set_network_header(skb, 0); | |
216 | skb_set_transport_header(skb, 0); | |
217 | ||
218 | /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */ | |
219 | skb_set_queue_mapping(skb, IEEE80211_AC_VO); | |
220 | skb->priority = 7; | |
221 | ||
222 | info->control.vif = &sdata->vif; | |
2154c81c | 223 | ieee80211_set_qos_hdr(sdata, skb); |
2cca397f JC |
224 | } |
225 | ||
050ac52c LCC |
226 | /** |
227 | * mesh_send_path error - Sends a PERR mesh management frame | |
228 | * | |
d19b3bf6 RP |
229 | * @target: broken destination |
230 | * @target_sn: SN of the broken destination | |
231 | * @target_rcode: reason code for this PERR | |
050ac52c | 232 | * @ra: node this frame is addressed to |
2cca397f JC |
233 | * |
234 | * Note: This function may be called with driver locks taken that the driver | |
235 | * also acquires in the TX path. To avoid a deadlock we don't transmit the | |
236 | * frame directly but add it to the pending queue instead. | |
050ac52c | 237 | */ |
d19b3bf6 | 238 | int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn, |
15ff6365 JB |
239 | __le16 target_rcode, const u8 *ra, |
240 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 241 | { |
f698d856 | 242 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 243 | struct sk_buff *skb; |
dca7e943 | 244 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 245 | struct ieee80211_mgmt *mgmt; |
3b69a9c5 TP |
246 | u8 *pos, ie_len; |
247 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + | |
248 | sizeof(mgmt->u.action.u.mesh_action); | |
050ac52c | 249 | |
dca7e943 TP |
250 | if (time_before(jiffies, ifmsh->next_perr)) |
251 | return -EAGAIN; | |
252 | ||
3b69a9c5 TP |
253 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + |
254 | hdr_len + | |
255 | 2 + 15 /* PERR IE */); | |
050ac52c LCC |
256 | if (!skb) |
257 | return -1; | |
2cca397f | 258 | skb_reserve(skb, local->tx_headroom + local->hw.extra_tx_headroom); |
3b69a9c5 TP |
259 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
260 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
261 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
262 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
263 | |
264 | memcpy(mgmt->da, ra, ETH_ALEN); | |
47846c9b | 265 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
266 | /* BSSID == SA */ |
267 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); | |
268 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; | |
269 | mgmt->u.action.u.mesh_action.action_code = | |
270 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
d611f062 | 271 | ie_len = 15; |
050ac52c LCC |
272 | pos = skb_put(skb, 2 + ie_len); |
273 | *pos++ = WLAN_EID_PERR; | |
274 | *pos++ = ie_len; | |
d611f062 | 275 | /* ttl */ |
45904f21 | 276 | *pos++ = ttl; |
050ac52c LCC |
277 | /* number of destinations */ |
278 | *pos++ = 1; | |
d611f062 RP |
279 | /* |
280 | * flags bit, bit 1 is unset if we know the sequence number and | |
281 | * bit 2 is set if we have a reason code | |
282 | */ | |
283 | *pos = 0; | |
d19b3bf6 | 284 | if (!target_sn) |
d611f062 | 285 | *pos |= MP_F_USN; |
d19b3bf6 | 286 | if (target_rcode) |
d611f062 RP |
287 | *pos |= MP_F_RCODE; |
288 | pos++; | |
d19b3bf6 | 289 | memcpy(pos, target, ETH_ALEN); |
050ac52c | 290 | pos += ETH_ALEN; |
d19b3bf6 | 291 | memcpy(pos, &target_sn, 4); |
d611f062 | 292 | pos += 4; |
d19b3bf6 | 293 | memcpy(pos, &target_rcode, 2); |
050ac52c | 294 | |
2cca397f JC |
295 | /* see note in function header */ |
296 | prepare_frame_for_deferred_tx(sdata, skb); | |
dca7e943 TP |
297 | ifmsh->next_perr = TU_TO_EXP_TIME( |
298 | ifmsh->mshcfg.dot11MeshHWMPperrMinInterval); | |
2cca397f | 299 | ieee80211_add_pending_skb(local, skb); |
050ac52c LCC |
300 | return 0; |
301 | } | |
302 | ||
bfc32e6a JC |
303 | void ieee80211s_update_metric(struct ieee80211_local *local, |
304 | struct sta_info *stainfo, struct sk_buff *skb) | |
305 | { | |
306 | struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); | |
307 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
308 | int failed; | |
309 | ||
310 | if (!ieee80211_is_data(hdr->frame_control)) | |
311 | return; | |
312 | ||
313 | failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); | |
314 | ||
315 | /* moving average, scaled to 100 */ | |
316 | stainfo->fail_avg = ((80 * stainfo->fail_avg + 5) / 100 + 20 * failed); | |
317 | if (stainfo->fail_avg > 95) | |
318 | mesh_plink_broken(stainfo); | |
319 | } | |
320 | ||
050ac52c LCC |
321 | static u32 airtime_link_metric_get(struct ieee80211_local *local, |
322 | struct sta_info *sta) | |
323 | { | |
324 | struct ieee80211_supported_band *sband; | |
325 | /* This should be adjusted for each device */ | |
326 | int device_constant = 1 << ARITH_SHIFT; | |
327 | int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; | |
328 | int s_unit = 1 << ARITH_SHIFT; | |
329 | int rate, err; | |
330 | u32 tx_time, estimated_retx; | |
331 | u64 result; | |
332 | ||
333 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; | |
334 | ||
335 | if (sta->fail_avg >= 100) | |
336 | return MAX_METRIC; | |
e6a9854b JB |
337 | |
338 | if (sta->last_tx_rate.flags & IEEE80211_TX_RC_MCS) | |
339 | return MAX_METRIC; | |
340 | ||
050ac52c LCC |
341 | err = (sta->fail_avg << ARITH_SHIFT) / 100; |
342 | ||
343 | /* bitrate is in units of 100 Kbps, while we need rate in units of | |
344 | * 1Mbps. This will be corrected on tx_time computation. | |
345 | */ | |
e6a9854b | 346 | rate = sband->bitrates[sta->last_tx_rate.idx].bitrate; |
050ac52c LCC |
347 | tx_time = (device_constant + 10 * test_frame_len / rate); |
348 | estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); | |
349 | result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ; | |
350 | return (u32)result; | |
351 | } | |
352 | ||
353 | /** | |
354 | * hwmp_route_info_get - Update routing info to originator and transmitter | |
355 | * | |
f698d856 | 356 | * @sdata: local mesh subif |
050ac52c LCC |
357 | * @mgmt: mesh management frame |
358 | * @hwmp_ie: hwmp information element (PREP or PREQ) | |
359 | * | |
360 | * This function updates the path routing information to the originator and the | |
f99288d1 | 361 | * transmitter of a HWMP PREQ or PREP frame. |
050ac52c LCC |
362 | * |
363 | * Returns: metric to frame originator or 0 if the frame should not be further | |
364 | * processed | |
365 | * | |
366 | * Notes: this function is the only place (besides user-provided info) where | |
367 | * path routing information is updated. | |
368 | */ | |
f698d856 | 369 | static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, |
050ac52c | 370 | struct ieee80211_mgmt *mgmt, |
dbb81c42 | 371 | u8 *hwmp_ie, enum mpath_frame_type action) |
050ac52c | 372 | { |
f698d856 | 373 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
374 | struct mesh_path *mpath; |
375 | struct sta_info *sta; | |
376 | bool fresh_info; | |
377 | u8 *orig_addr, *ta; | |
d19b3bf6 | 378 | u32 orig_sn, orig_metric; |
050ac52c LCC |
379 | unsigned long orig_lifetime, exp_time; |
380 | u32 last_hop_metric, new_metric; | |
381 | bool process = true; | |
050ac52c LCC |
382 | |
383 | rcu_read_lock(); | |
abe60632 | 384 | sta = sta_info_get(sdata, mgmt->sa); |
dc0b0f7d JB |
385 | if (!sta) { |
386 | rcu_read_unlock(); | |
050ac52c | 387 | return 0; |
dc0b0f7d | 388 | } |
050ac52c LCC |
389 | |
390 | last_hop_metric = airtime_link_metric_get(local, sta); | |
391 | /* Update and check originator routing info */ | |
392 | fresh_info = true; | |
393 | ||
394 | switch (action) { | |
395 | case MPATH_PREQ: | |
396 | orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); | |
d19b3bf6 | 397 | orig_sn = PREQ_IE_ORIG_SN(hwmp_ie); |
050ac52c LCC |
398 | orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); |
399 | orig_metric = PREQ_IE_METRIC(hwmp_ie); | |
400 | break; | |
401 | case MPATH_PREP: | |
3c26f1f6 TP |
402 | /* Originator here refers to the MP that was the target in the |
403 | * Path Request. We divert from the nomenclature in the draft | |
050ac52c LCC |
404 | * so that we can easily use a single function to gather path |
405 | * information from both PREQ and PREP frames. | |
406 | */ | |
3c26f1f6 TP |
407 | orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie); |
408 | orig_sn = PREP_IE_TARGET_SN(hwmp_ie); | |
050ac52c LCC |
409 | orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); |
410 | orig_metric = PREP_IE_METRIC(hwmp_ie); | |
411 | break; | |
412 | default: | |
dc0b0f7d | 413 | rcu_read_unlock(); |
050ac52c LCC |
414 | return 0; |
415 | } | |
416 | new_metric = orig_metric + last_hop_metric; | |
417 | if (new_metric < orig_metric) | |
418 | new_metric = MAX_METRIC; | |
419 | exp_time = TU_TO_EXP_TIME(orig_lifetime); | |
420 | ||
47846c9b | 421 | if (memcmp(orig_addr, sdata->vif.addr, ETH_ALEN) == 0) { |
050ac52c LCC |
422 | /* This MP is the originator, we are not interested in this |
423 | * frame, except for updating transmitter's path info. | |
424 | */ | |
425 | process = false; | |
426 | fresh_info = false; | |
427 | } else { | |
f698d856 | 428 | mpath = mesh_path_lookup(orig_addr, sdata); |
050ac52c LCC |
429 | if (mpath) { |
430 | spin_lock_bh(&mpath->state_lock); | |
431 | if (mpath->flags & MESH_PATH_FIXED) | |
432 | fresh_info = false; | |
433 | else if ((mpath->flags & MESH_PATH_ACTIVE) && | |
d19b3bf6 RP |
434 | (mpath->flags & MESH_PATH_SN_VALID)) { |
435 | if (SN_GT(mpath->sn, orig_sn) || | |
436 | (mpath->sn == orig_sn && | |
533866b1 | 437 | new_metric >= mpath->metric)) { |
050ac52c LCC |
438 | process = false; |
439 | fresh_info = false; | |
440 | } | |
441 | } | |
442 | } else { | |
f698d856 JBG |
443 | mesh_path_add(orig_addr, sdata); |
444 | mpath = mesh_path_lookup(orig_addr, sdata); | |
050ac52c LCC |
445 | if (!mpath) { |
446 | rcu_read_unlock(); | |
050ac52c LCC |
447 | return 0; |
448 | } | |
449 | spin_lock_bh(&mpath->state_lock); | |
450 | } | |
451 | ||
452 | if (fresh_info) { | |
453 | mesh_path_assign_nexthop(mpath, sta); | |
d19b3bf6 | 454 | mpath->flags |= MESH_PATH_SN_VALID; |
050ac52c | 455 | mpath->metric = new_metric; |
d19b3bf6 | 456 | mpath->sn = orig_sn; |
050ac52c LCC |
457 | mpath->exp_time = time_after(mpath->exp_time, exp_time) |
458 | ? mpath->exp_time : exp_time; | |
459 | mesh_path_activate(mpath); | |
460 | spin_unlock_bh(&mpath->state_lock); | |
461 | mesh_path_tx_pending(mpath); | |
462 | /* draft says preq_id should be saved to, but there does | |
463 | * not seem to be any use for it, skipping by now | |
464 | */ | |
465 | } else | |
466 | spin_unlock_bh(&mpath->state_lock); | |
467 | } | |
468 | ||
469 | /* Update and check transmitter routing info */ | |
470 | ta = mgmt->sa; | |
471 | if (memcmp(orig_addr, ta, ETH_ALEN) == 0) | |
472 | fresh_info = false; | |
473 | else { | |
474 | fresh_info = true; | |
475 | ||
f698d856 | 476 | mpath = mesh_path_lookup(ta, sdata); |
050ac52c LCC |
477 | if (mpath) { |
478 | spin_lock_bh(&mpath->state_lock); | |
479 | if ((mpath->flags & MESH_PATH_FIXED) || | |
480 | ((mpath->flags & MESH_PATH_ACTIVE) && | |
481 | (last_hop_metric > mpath->metric))) | |
482 | fresh_info = false; | |
483 | } else { | |
f698d856 JBG |
484 | mesh_path_add(ta, sdata); |
485 | mpath = mesh_path_lookup(ta, sdata); | |
050ac52c LCC |
486 | if (!mpath) { |
487 | rcu_read_unlock(); | |
050ac52c LCC |
488 | return 0; |
489 | } | |
490 | spin_lock_bh(&mpath->state_lock); | |
491 | } | |
492 | ||
493 | if (fresh_info) { | |
494 | mesh_path_assign_nexthop(mpath, sta); | |
050ac52c LCC |
495 | mpath->metric = last_hop_metric; |
496 | mpath->exp_time = time_after(mpath->exp_time, exp_time) | |
497 | ? mpath->exp_time : exp_time; | |
498 | mesh_path_activate(mpath); | |
499 | spin_unlock_bh(&mpath->state_lock); | |
500 | mesh_path_tx_pending(mpath); | |
501 | } else | |
502 | spin_unlock_bh(&mpath->state_lock); | |
503 | } | |
504 | ||
050ac52c LCC |
505 | rcu_read_unlock(); |
506 | ||
507 | return process ? new_metric : 0; | |
508 | } | |
509 | ||
f698d856 | 510 | static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c | 511 | struct ieee80211_mgmt *mgmt, |
57ef5ddb DW |
512 | u8 *preq_elem, u32 metric) |
513 | { | |
472dbc45 | 514 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 515 | struct mesh_path *mpath; |
d19b3bf6 RP |
516 | u8 *target_addr, *orig_addr; |
517 | u8 target_flags, ttl; | |
518 | u32 orig_sn, target_sn, lifetime; | |
050ac52c LCC |
519 | bool reply = false; |
520 | bool forward = true; | |
521 | ||
d19b3bf6 RP |
522 | /* Update target SN, if present */ |
523 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
050ac52c | 524 | orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); |
d19b3bf6 RP |
525 | target_sn = PREQ_IE_TARGET_SN(preq_elem); |
526 | orig_sn = PREQ_IE_ORIG_SN(preq_elem); | |
527 | target_flags = PREQ_IE_TARGET_F(preq_elem); | |
050ac52c | 528 | |
7646887a | 529 | mhwmp_dbg("received PREQ from %pM", orig_addr); |
27db2e42 | 530 | |
47846c9b | 531 | if (memcmp(target_addr, sdata->vif.addr, ETH_ALEN) == 0) { |
7646887a | 532 | mhwmp_dbg("PREQ is for us"); |
050ac52c LCC |
533 | forward = false; |
534 | reply = true; | |
535 | metric = 0; | |
d19b3bf6 | 536 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 537 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
538 | time_before(jiffies, ifmsh->last_sn_update)) { |
539 | target_sn = ++ifmsh->sn; | |
540 | ifmsh->last_sn_update = jiffies; | |
050ac52c LCC |
541 | } |
542 | } else { | |
543 | rcu_read_lock(); | |
d19b3bf6 | 544 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c | 545 | if (mpath) { |
d19b3bf6 RP |
546 | if ((!(mpath->flags & MESH_PATH_SN_VALID)) || |
547 | SN_LT(mpath->sn, target_sn)) { | |
548 | mpath->sn = target_sn; | |
549 | mpath->flags |= MESH_PATH_SN_VALID; | |
550 | } else if ((!(target_flags & MP_F_DO)) && | |
050ac52c LCC |
551 | (mpath->flags & MESH_PATH_ACTIVE)) { |
552 | reply = true; | |
553 | metric = mpath->metric; | |
d19b3bf6 RP |
554 | target_sn = mpath->sn; |
555 | if (target_flags & MP_F_RF) | |
556 | target_flags |= MP_F_DO; | |
050ac52c LCC |
557 | else |
558 | forward = false; | |
559 | } | |
560 | } | |
561 | rcu_read_unlock(); | |
562 | } | |
563 | ||
564 | if (reply) { | |
565 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
45904f21 | 566 | ttl = ifmsh->mshcfg.element_ttl; |
27db2e42 | 567 | if (ttl != 0) { |
7646887a | 568 | mhwmp_dbg("replying to the PREQ"); |
3c26f1f6 TP |
569 | mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr, |
570 | cpu_to_le32(orig_sn), 0, target_addr, | |
571 | cpu_to_le32(target_sn), mgmt->sa, 0, ttl, | |
aa2b5928 | 572 | cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 573 | 0, sdata); |
27db2e42 | 574 | } else |
472dbc45 | 575 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
576 | } |
577 | ||
578 | if (forward) { | |
579 | u32 preq_id; | |
580 | u8 hopcount, flags; | |
581 | ||
582 | ttl = PREQ_IE_TTL(preq_elem); | |
583 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
584 | if (ttl <= 1) { | |
472dbc45 | 585 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
586 | return; |
587 | } | |
7646887a | 588 | mhwmp_dbg("forwarding the PREQ from %pM", orig_addr); |
050ac52c LCC |
589 | --ttl; |
590 | flags = PREQ_IE_FLAGS(preq_elem); | |
591 | preq_id = PREQ_IE_PREQ_ID(preq_elem); | |
592 | hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; | |
593 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, | |
d19b3bf6 | 594 | cpu_to_le32(orig_sn), target_flags, target_addr, |
15ff6365 | 595 | cpu_to_le32(target_sn), broadcast_addr, |
aa2b5928 LCC |
596 | hopcount, ttl, cpu_to_le32(lifetime), |
597 | cpu_to_le32(metric), cpu_to_le32(preq_id), | |
f698d856 | 598 | sdata); |
c8a61a7d | 599 | ifmsh->mshstats.fwded_mcast++; |
472dbc45 | 600 | ifmsh->mshstats.fwded_frames++; |
050ac52c LCC |
601 | } |
602 | } | |
603 | ||
604 | ||
40b275b6 JB |
605 | static inline struct sta_info * |
606 | next_hop_deref_protected(struct mesh_path *mpath) | |
607 | { | |
608 | return rcu_dereference_protected(mpath->next_hop, | |
609 | lockdep_is_held(&mpath->state_lock)); | |
610 | } | |
611 | ||
612 | ||
f698d856 | 613 | static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
614 | struct ieee80211_mgmt *mgmt, |
615 | u8 *prep_elem, u32 metric) | |
616 | { | |
050ac52c | 617 | struct mesh_path *mpath; |
d19b3bf6 | 618 | u8 *target_addr, *orig_addr; |
050ac52c LCC |
619 | u8 ttl, hopcount, flags; |
620 | u8 next_hop[ETH_ALEN]; | |
d19b3bf6 | 621 | u32 target_sn, orig_sn, lifetime; |
050ac52c | 622 | |
7646887a | 623 | mhwmp_dbg("received PREP from %pM", PREP_IE_ORIG_ADDR(prep_elem)); |
dbb81c42 | 624 | |
3c26f1f6 TP |
625 | orig_addr = PREP_IE_ORIG_ADDR(prep_elem); |
626 | if (memcmp(orig_addr, sdata->vif.addr, ETH_ALEN) == 0) | |
050ac52c LCC |
627 | /* destination, no forwarding required */ |
628 | return; | |
629 | ||
630 | ttl = PREP_IE_TTL(prep_elem); | |
631 | if (ttl <= 1) { | |
472dbc45 | 632 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
633 | return; |
634 | } | |
635 | ||
636 | rcu_read_lock(); | |
3c26f1f6 | 637 | mpath = mesh_path_lookup(orig_addr, sdata); |
050ac52c LCC |
638 | if (mpath) |
639 | spin_lock_bh(&mpath->state_lock); | |
640 | else | |
641 | goto fail; | |
642 | if (!(mpath->flags & MESH_PATH_ACTIVE)) { | |
643 | spin_unlock_bh(&mpath->state_lock); | |
644 | goto fail; | |
645 | } | |
40b275b6 | 646 | memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN); |
050ac52c LCC |
647 | spin_unlock_bh(&mpath->state_lock); |
648 | --ttl; | |
649 | flags = PREP_IE_FLAGS(prep_elem); | |
650 | lifetime = PREP_IE_LIFETIME(prep_elem); | |
651 | hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; | |
3c26f1f6 | 652 | target_addr = PREP_IE_TARGET_ADDR(prep_elem); |
d19b3bf6 RP |
653 | target_sn = PREP_IE_TARGET_SN(prep_elem); |
654 | orig_sn = PREP_IE_ORIG_SN(prep_elem); | |
050ac52c LCC |
655 | |
656 | mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, | |
d19b3bf6 | 657 | cpu_to_le32(orig_sn), 0, target_addr, |
533866b1 | 658 | cpu_to_le32(target_sn), next_hop, hopcount, |
d19b3bf6 | 659 | ttl, cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 660 | 0, sdata); |
050ac52c | 661 | rcu_read_unlock(); |
c8a61a7d DW |
662 | |
663 | sdata->u.mesh.mshstats.fwded_unicast++; | |
472dbc45 | 664 | sdata->u.mesh.mshstats.fwded_frames++; |
050ac52c LCC |
665 | return; |
666 | ||
667 | fail: | |
668 | rcu_read_unlock(); | |
472dbc45 | 669 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
670 | } |
671 | ||
f698d856 | 672 | static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
673 | struct ieee80211_mgmt *mgmt, u8 *perr_elem) |
674 | { | |
d611f062 | 675 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 676 | struct mesh_path *mpath; |
d611f062 | 677 | u8 ttl; |
d19b3bf6 | 678 | u8 *ta, *target_addr; |
d19b3bf6 RP |
679 | u32 target_sn; |
680 | u16 target_rcode; | |
050ac52c LCC |
681 | |
682 | ta = mgmt->sa; | |
d611f062 RP |
683 | ttl = PERR_IE_TTL(perr_elem); |
684 | if (ttl <= 1) { | |
685 | ifmsh->mshstats.dropped_frames_ttl++; | |
686 | return; | |
687 | } | |
688 | ttl--; | |
d19b3bf6 RP |
689 | target_addr = PERR_IE_TARGET_ADDR(perr_elem); |
690 | target_sn = PERR_IE_TARGET_SN(perr_elem); | |
691 | target_rcode = PERR_IE_TARGET_RCODE(perr_elem); | |
d611f062 | 692 | |
050ac52c | 693 | rcu_read_lock(); |
d19b3bf6 | 694 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c LCC |
695 | if (mpath) { |
696 | spin_lock_bh(&mpath->state_lock); | |
697 | if (mpath->flags & MESH_PATH_ACTIVE && | |
40b275b6 JB |
698 | memcmp(ta, next_hop_deref_protected(mpath)->sta.addr, |
699 | ETH_ALEN) == 0 && | |
d19b3bf6 RP |
700 | (!(mpath->flags & MESH_PATH_SN_VALID) || |
701 | SN_GT(target_sn, mpath->sn))) { | |
050ac52c | 702 | mpath->flags &= ~MESH_PATH_ACTIVE; |
d19b3bf6 | 703 | mpath->sn = target_sn; |
050ac52c | 704 | spin_unlock_bh(&mpath->state_lock); |
d19b3bf6 RP |
705 | mesh_path_error_tx(ttl, target_addr, cpu_to_le32(target_sn), |
706 | cpu_to_le16(target_rcode), | |
15ff6365 | 707 | broadcast_addr, sdata); |
050ac52c LCC |
708 | } else |
709 | spin_unlock_bh(&mpath->state_lock); | |
710 | } | |
711 | rcu_read_unlock(); | |
712 | } | |
713 | ||
90a5e169 RP |
714 | static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, |
715 | struct ieee80211_mgmt *mgmt, | |
716 | struct ieee80211_rann_ie *rann) | |
717 | { | |
718 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
719 | struct mesh_path *mpath; | |
90a5e169 RP |
720 | u8 ttl, flags, hopcount; |
721 | u8 *orig_addr; | |
d19b3bf6 | 722 | u32 orig_sn, metric; |
0507e159 | 723 | u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; |
5ee68e5b | 724 | bool root_is_gate; |
90a5e169 | 725 | |
90a5e169 RP |
726 | ttl = rann->rann_ttl; |
727 | if (ttl <= 1) { | |
728 | ifmsh->mshstats.dropped_frames_ttl++; | |
729 | return; | |
730 | } | |
731 | ttl--; | |
732 | flags = rann->rann_flags; | |
5ee68e5b | 733 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); |
90a5e169 | 734 | orig_addr = rann->rann_addr; |
d19b3bf6 | 735 | orig_sn = rann->rann_seq; |
90a5e169 | 736 | hopcount = rann->rann_hopcount; |
a6a58b4f | 737 | hopcount++; |
90a5e169 | 738 | metric = rann->rann_metric; |
5ee68e5b JC |
739 | |
740 | /* Ignore our own RANNs */ | |
741 | if (memcmp(orig_addr, sdata->vif.addr, ETH_ALEN) == 0) | |
742 | return; | |
743 | ||
744 | mhwmp_dbg("received RANN from %pM (is_gate=%d)", orig_addr, | |
745 | root_is_gate); | |
90a5e169 RP |
746 | |
747 | rcu_read_lock(); | |
748 | mpath = mesh_path_lookup(orig_addr, sdata); | |
749 | if (!mpath) { | |
750 | mesh_path_add(orig_addr, sdata); | |
751 | mpath = mesh_path_lookup(orig_addr, sdata); | |
752 | if (!mpath) { | |
753 | rcu_read_unlock(); | |
754 | sdata->u.mesh.mshstats.dropped_frames_no_route++; | |
755 | return; | |
756 | } | |
90a5e169 | 757 | } |
5ee68e5b JC |
758 | |
759 | if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) || | |
760 | time_after(jiffies, mpath->exp_time - 1*HZ)) && | |
761 | !(mpath->flags & MESH_PATH_FIXED)) { | |
762 | mhwmp_dbg("%s time to refresh root mpath %pM", sdata->name, | |
763 | orig_addr); | |
764 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
765 | } | |
766 | ||
d19b3bf6 | 767 | if (mpath->sn < orig_sn) { |
90a5e169 | 768 | mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, |
d19b3bf6 | 769 | cpu_to_le32(orig_sn), |
15ff6365 | 770 | 0, NULL, 0, broadcast_addr, |
0507e159 | 771 | hopcount, ttl, cpu_to_le32(interval), |
a6a58b4f | 772 | cpu_to_le32(metric + mpath->metric), |
90a5e169 | 773 | 0, sdata); |
d19b3bf6 | 774 | mpath->sn = orig_sn; |
90a5e169 | 775 | } |
5ee68e5b JC |
776 | if (root_is_gate) |
777 | mesh_path_add_gate(mpath); | |
778 | ||
90a5e169 RP |
779 | rcu_read_unlock(); |
780 | } | |
050ac52c LCC |
781 | |
782 | ||
f698d856 | 783 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
784 | struct ieee80211_mgmt *mgmt, |
785 | size_t len) | |
786 | { | |
787 | struct ieee802_11_elems elems; | |
788 | size_t baselen; | |
789 | u32 last_hop_metric; | |
97091317 | 790 | struct sta_info *sta; |
050ac52c | 791 | |
9c80d3dc JB |
792 | /* need action_code */ |
793 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
794 | return; | |
795 | ||
97091317 JC |
796 | rcu_read_lock(); |
797 | sta = sta_info_get(sdata, mgmt->sa); | |
798 | if (!sta || sta->plink_state != NL80211_PLINK_ESTAB) { | |
799 | rcu_read_unlock(); | |
800 | return; | |
801 | } | |
802 | rcu_read_unlock(); | |
803 | ||
050ac52c LCC |
804 | baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
805 | ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, | |
806 | len - baselen, &elems); | |
807 | ||
dbb81c42 RP |
808 | if (elems.preq) { |
809 | if (elems.preq_len != 37) | |
050ac52c LCC |
810 | /* Right now we support just 1 destination and no AE */ |
811 | return; | |
dbb81c42 RP |
812 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq, |
813 | MPATH_PREQ); | |
814 | if (last_hop_metric) | |
815 | hwmp_preq_frame_process(sdata, mgmt, elems.preq, | |
816 | last_hop_metric); | |
817 | } | |
818 | if (elems.prep) { | |
819 | if (elems.prep_len != 31) | |
050ac52c LCC |
820 | /* Right now we support no AE */ |
821 | return; | |
dbb81c42 RP |
822 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep, |
823 | MPATH_PREP); | |
824 | if (last_hop_metric) | |
825 | hwmp_prep_frame_process(sdata, mgmt, elems.prep, | |
826 | last_hop_metric); | |
827 | } | |
828 | if (elems.perr) { | |
d611f062 | 829 | if (elems.perr_len != 15) |
050ac52c LCC |
830 | /* Right now we support only one destination per PERR */ |
831 | return; | |
f698d856 | 832 | hwmp_perr_frame_process(sdata, mgmt, elems.perr); |
050ac52c | 833 | } |
90a5e169 RP |
834 | if (elems.rann) |
835 | hwmp_rann_frame_process(sdata, mgmt, elems.rann); | |
050ac52c LCC |
836 | } |
837 | ||
838 | /** | |
839 | * mesh_queue_preq - queue a PREQ to a given destination | |
840 | * | |
841 | * @mpath: mesh path to discover | |
842 | * @flags: special attributes of the PREQ to be sent | |
843 | * | |
844 | * Locking: the function must be called from within a rcu read lock block. | |
845 | * | |
846 | */ | |
847 | static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) | |
848 | { | |
f698d856 | 849 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
472dbc45 | 850 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
851 | struct mesh_preq_queue *preq_node; |
852 | ||
59615b5f | 853 | preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); |
050ac52c | 854 | if (!preq_node) { |
7646887a | 855 | mhwmp_dbg("could not allocate PREQ node"); |
050ac52c LCC |
856 | return; |
857 | } | |
858 | ||
987dafad | 859 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 | 860 | if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { |
987dafad | 861 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
862 | kfree(preq_node); |
863 | if (printk_ratelimit()) | |
7646887a | 864 | mhwmp_dbg("PREQ node queue full"); |
050ac52c LCC |
865 | return; |
866 | } | |
867 | ||
f2dc7989 | 868 | spin_lock(&mpath->state_lock); |
f3011cf9 | 869 | if (mpath->flags & MESH_PATH_REQ_QUEUED) { |
f2dc7989 | 870 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 871 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
88d53465 | 872 | kfree(preq_node); |
f3011cf9 JC |
873 | return; |
874 | } | |
875 | ||
050ac52c LCC |
876 | memcpy(preq_node->dst, mpath->dst, ETH_ALEN); |
877 | preq_node->flags = flags; | |
878 | ||
f3011cf9 | 879 | mpath->flags |= MESH_PATH_REQ_QUEUED; |
f2dc7989 | 880 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 881 | |
472dbc45 JB |
882 | list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
883 | ++ifmsh->preq_queue_len; | |
987dafad | 884 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c | 885 | |
472dbc45 | 886 | if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
64592c8f | 887 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 888 | |
472dbc45 | 889 | else if (time_before(jiffies, ifmsh->last_preq)) { |
050ac52c LCC |
890 | /* avoid long wait if did not send preqs for a long time |
891 | * and jiffies wrapped around | |
892 | */ | |
472dbc45 | 893 | ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
64592c8f | 894 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 895 | } else |
472dbc45 | 896 | mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
050ac52c LCC |
897 | min_preq_int_jiff(sdata)); |
898 | } | |
899 | ||
900 | /** | |
901 | * mesh_path_start_discovery - launch a path discovery from the PREQ queue | |
902 | * | |
f698d856 | 903 | * @sdata: local mesh subif |
050ac52c | 904 | */ |
f698d856 | 905 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
050ac52c | 906 | { |
472dbc45 | 907 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
908 | struct mesh_preq_queue *preq_node; |
909 | struct mesh_path *mpath; | |
d19b3bf6 | 910 | u8 ttl, target_flags; |
050ac52c LCC |
911 | u32 lifetime; |
912 | ||
a43816df | 913 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 JB |
914 | if (!ifmsh->preq_queue_len || |
915 | time_before(jiffies, ifmsh->last_preq + | |
050ac52c | 916 | min_preq_int_jiff(sdata))) { |
a43816df | 917 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
918 | return; |
919 | } | |
920 | ||
472dbc45 | 921 | preq_node = list_first_entry(&ifmsh->preq_queue.list, |
050ac52c LCC |
922 | struct mesh_preq_queue, list); |
923 | list_del(&preq_node->list); | |
472dbc45 | 924 | --ifmsh->preq_queue_len; |
a43816df | 925 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
926 | |
927 | rcu_read_lock(); | |
f698d856 | 928 | mpath = mesh_path_lookup(preq_node->dst, sdata); |
050ac52c LCC |
929 | if (!mpath) |
930 | goto enddiscovery; | |
931 | ||
932 | spin_lock_bh(&mpath->state_lock); | |
f3011cf9 | 933 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
050ac52c LCC |
934 | if (preq_node->flags & PREQ_Q_F_START) { |
935 | if (mpath->flags & MESH_PATH_RESOLVING) { | |
936 | spin_unlock_bh(&mpath->state_lock); | |
937 | goto enddiscovery; | |
938 | } else { | |
939 | mpath->flags &= ~MESH_PATH_RESOLVED; | |
940 | mpath->flags |= MESH_PATH_RESOLVING; | |
941 | mpath->discovery_retries = 0; | |
942 | mpath->discovery_timeout = disc_timeout_jiff(sdata); | |
943 | } | |
944 | } else if (!(mpath->flags & MESH_PATH_RESOLVING) || | |
945 | mpath->flags & MESH_PATH_RESOLVED) { | |
946 | mpath->flags &= ~MESH_PATH_RESOLVING; | |
947 | spin_unlock_bh(&mpath->state_lock); | |
948 | goto enddiscovery; | |
949 | } | |
950 | ||
472dbc45 | 951 | ifmsh->last_preq = jiffies; |
050ac52c | 952 | |
d19b3bf6 | 953 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 954 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
955 | time_before(jiffies, ifmsh->last_sn_update)) { |
956 | ++ifmsh->sn; | |
957 | sdata->u.mesh.last_sn_update = jiffies; | |
050ac52c LCC |
958 | } |
959 | lifetime = default_lifetime(sdata); | |
45904f21 | 960 | ttl = sdata->u.mesh.mshcfg.element_ttl; |
050ac52c | 961 | if (ttl == 0) { |
472dbc45 | 962 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
963 | spin_unlock_bh(&mpath->state_lock); |
964 | goto enddiscovery; | |
965 | } | |
966 | ||
967 | if (preq_node->flags & PREQ_Q_F_REFRESH) | |
d19b3bf6 | 968 | target_flags = MP_F_DO; |
050ac52c | 969 | else |
d19b3bf6 | 970 | target_flags = MP_F_RF; |
050ac52c LCC |
971 | |
972 | spin_unlock_bh(&mpath->state_lock); | |
47846c9b | 973 | mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, |
d19b3bf6 | 974 | cpu_to_le32(ifmsh->sn), target_flags, mpath->dst, |
15ff6365 | 975 | cpu_to_le32(mpath->sn), broadcast_addr, 0, |
aa2b5928 | 976 | ttl, cpu_to_le32(lifetime), 0, |
472dbc45 | 977 | cpu_to_le32(ifmsh->preq_id++), sdata); |
050ac52c LCC |
978 | mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); |
979 | ||
980 | enddiscovery: | |
981 | rcu_read_unlock(); | |
982 | kfree(preq_node); | |
983 | } | |
984 | ||
0cfda851 TP |
985 | /* mesh_nexthop_resolve - lookup next hop for given skb and start path |
986 | * discovery if no forwarding information is found. | |
050ac52c | 987 | * |
e32f85f7 | 988 | * @skb: 802.11 frame to be sent |
f698d856 | 989 | * @sdata: network subif the frame will be sent through |
050ac52c | 990 | * |
0cfda851 TP |
991 | * Returns: 0 if the next hop was found and -ENOENT if the frame was queued. |
992 | * skb is freeed here if no mpath could be allocated. | |
050ac52c | 993 | */ |
0cfda851 TP |
994 | int mesh_nexthop_resolve(struct sk_buff *skb, |
995 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 996 | { |
e32f85f7 | 997 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
0cfda851 TP |
998 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
999 | struct mesh_path *mpath; | |
1000 | struct sk_buff *skb_to_free = NULL; | |
d19b3bf6 | 1001 | u8 *target_addr = hdr->addr3; |
050ac52c LCC |
1002 | int err = 0; |
1003 | ||
1004 | rcu_read_lock(); | |
0cfda851 TP |
1005 | err = mesh_nexthop_lookup(skb, sdata); |
1006 | if (!err) | |
1007 | goto endlookup; | |
050ac52c | 1008 | |
0cfda851 TP |
1009 | /* no nexthop found, start resolving */ |
1010 | mpath = mesh_path_lookup(target_addr, sdata); | |
050ac52c | 1011 | if (!mpath) { |
d19b3bf6 RP |
1012 | mesh_path_add(target_addr, sdata); |
1013 | mpath = mesh_path_lookup(target_addr, sdata); | |
050ac52c | 1014 | if (!mpath) { |
0cfda851 | 1015 | mesh_path_discard_frame(skb, sdata); |
050ac52c LCC |
1016 | err = -ENOSPC; |
1017 | goto endlookup; | |
1018 | } | |
1019 | } | |
1020 | ||
0cfda851 TP |
1021 | if (!(mpath->flags & MESH_PATH_RESOLVING)) |
1022 | mesh_queue_preq(mpath, PREQ_Q_F_START); | |
1023 | ||
1024 | if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN) | |
1025 | skb_to_free = skb_dequeue(&mpath->frame_queue); | |
1026 | ||
1027 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1028 | ieee80211_set_qos_hdr(sdata, skb); | |
1029 | skb_queue_tail(&mpath->frame_queue, skb); | |
1030 | err = -ENOENT; | |
1031 | if (skb_to_free) | |
1032 | mesh_path_discard_frame(skb_to_free, sdata); | |
1033 | ||
1034 | endlookup: | |
1035 | rcu_read_unlock(); | |
1036 | return err; | |
1037 | } | |
1038 | /** | |
1039 | * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling | |
1040 | * this function is considered "using" the associated mpath, so preempt a path | |
1041 | * refresh if this mpath expires soon. | |
1042 | * | |
1043 | * @skb: 802.11 frame to be sent | |
1044 | * @sdata: network subif the frame will be sent through | |
1045 | * | |
1046 | * Returns: 0 if the next hop was found. Nonzero otherwise. | |
1047 | */ | |
1048 | int mesh_nexthop_lookup(struct sk_buff *skb, | |
1049 | struct ieee80211_sub_if_data *sdata) | |
1050 | { | |
1051 | struct mesh_path *mpath; | |
1052 | struct sta_info *next_hop; | |
1053 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
1054 | u8 *target_addr = hdr->addr3; | |
1055 | int err = -ENOENT; | |
050ac52c | 1056 | |
0cfda851 TP |
1057 | rcu_read_lock(); |
1058 | mpath = mesh_path_lookup(target_addr, sdata); | |
1059 | ||
1060 | if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE)) | |
1061 | goto endlookup; | |
1062 | ||
1063 | if (time_after(jiffies, | |
1064 | mpath->exp_time - | |
1065 | msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) && | |
1066 | !memcmp(sdata->vif.addr, hdr->addr4, ETH_ALEN) && | |
1067 | !(mpath->flags & MESH_PATH_RESOLVING) && | |
1068 | !(mpath->flags & MESH_PATH_FIXED)) | |
1069 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
050ac52c | 1070 | |
0cfda851 TP |
1071 | next_hop = rcu_dereference(mpath->next_hop); |
1072 | if (next_hop) { | |
1073 | memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN); | |
1074 | memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); | |
1075 | err = 0; | |
050ac52c LCC |
1076 | } |
1077 | ||
1078 | endlookup: | |
1079 | rcu_read_unlock(); | |
1080 | return err; | |
1081 | } | |
1082 | ||
1083 | void mesh_path_timer(unsigned long data) | |
1084 | { | |
dea4096b JB |
1085 | struct mesh_path *mpath = (void *) data; |
1086 | struct ieee80211_sub_if_data *sdata = mpath->sdata; | |
5ee68e5b | 1087 | int ret; |
5bb644a0 | 1088 | |
dea4096b | 1089 | if (sdata->local->quiescing) |
5bb644a0 | 1090 | return; |
5bb644a0 JB |
1091 | |
1092 | spin_lock_bh(&mpath->state_lock); | |
cfa22c71 | 1093 | if (mpath->flags & MESH_PATH_RESOLVED || |
5ee68e5b | 1094 | (!(mpath->flags & MESH_PATH_RESOLVING))) { |
050ac52c | 1095 | mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); |
5ee68e5b JC |
1096 | spin_unlock_bh(&mpath->state_lock); |
1097 | } else if (mpath->discovery_retries < max_preq_retries(sdata)) { | |
050ac52c LCC |
1098 | ++mpath->discovery_retries; |
1099 | mpath->discovery_timeout *= 2; | |
f3011cf9 | 1100 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
5ee68e5b | 1101 | spin_unlock_bh(&mpath->state_lock); |
050ac52c LCC |
1102 | mesh_queue_preq(mpath, 0); |
1103 | } else { | |
1104 | mpath->flags = 0; | |
1105 | mpath->exp_time = jiffies; | |
5ee68e5b JC |
1106 | spin_unlock_bh(&mpath->state_lock); |
1107 | if (!mpath->is_gate && mesh_gate_num(sdata) > 0) { | |
1108 | ret = mesh_path_send_to_gates(mpath); | |
1109 | if (ret) | |
1110 | mhwmp_dbg("no gate was reachable"); | |
1111 | } else | |
1112 | mesh_path_flush_pending(mpath); | |
050ac52c | 1113 | } |
050ac52c | 1114 | } |
e304bfd3 RP |
1115 | |
1116 | void | |
1117 | mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata) | |
1118 | { | |
1119 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
0507e159 | 1120 | u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; |
16dd7267 | 1121 | u8 flags; |
e304bfd3 | 1122 | |
16dd7267 JC |
1123 | flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol) |
1124 | ? RANN_FLAG_IS_GATE : 0; | |
1125 | mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr, | |
e304bfd3 | 1126 | cpu_to_le32(++ifmsh->sn), |
15ff6365 | 1127 | 0, NULL, 0, broadcast_addr, |
45904f21 | 1128 | 0, sdata->u.mesh.mshcfg.element_ttl, |
0507e159 | 1129 | cpu_to_le32(interval), 0, 0, sdata); |
e304bfd3 | 1130 | } |